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Date: Thu, 16 Apr 2009 14:59:20 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-help] driver: IOCTL command behavior
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To: Marcel Soulot <msoulot@domain.hid>
Cc: xenomai@xenomai.org

Marcel Soulot wrote:
> Hi,
> 
> I wrote a driver and used IOCTL command. When I test my driver with a test
> application with root access the IOCTL cmd work fine.
> I notice when I declared my IOCTL command that I used the _IOR for all of
> them. Even the IOCTL command is a read (on register) or write.
> So I try to correct my mistake and wants to use _IOR for read command and
> _IOW for write command.
> For the write command, I got a error -25 (not a typewriter) so I don't
> understand why.
> I also try to change the _IOW to _IOWR but same mistake.
> 
> Someone can explain what is the problem, please ?

A piece of code is worth a thousand words...

-- 
                                                 Gilles.